Bed frame



FIG. 1 is a front perspective view of a bed frame showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a left side elevation view thereof; the right side elevation view being a mirror image thereof; and,

FIG. 4 is a top plan view thereof.

The broken line showing of the circular features illustrates portions of the bed frame that form no part of the claimed design. Views of the bed frame not shown in the figures form no part of the claimed design. 

CLAIM The ornamental design for a bed frame, as shown and described. 